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Space-time crystals from particle-like topological solitons.

Hanqing Zhao1,2, Ivan I Smalyukh3,4,5,6

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This summary is machine-generated.

Researchers report the first continuous space-time crystal, a novel state of matter breaking both space and time symmetries. This discovery in liquid crystals, driven by light, opens doors for new optical technologies.

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Area of Science:

  • Condensed Matter Physics
  • Non-equilibrium Physics
  • Liquid Crystal Science

Background:

  • Time crystals break time-translation symmetry, but spatially mesoscale space-time crystals remain elusive.
  • Existing time crystals typically break symmetry discretely or continuously, but not simultaneously with spatial symmetry.

Purpose of the Study:

  • To report the first experimental observation of a continuous space-time crystal.
  • To investigate the formation and properties of space-time crystals in nematic liquid crystals.
  • To explore the potential technological applications of these novel states of matter.

Main Methods:

  • Experimental realization of a continuous space-time crystal in a nematic liquid crystal.
  • Driving the system with ambient-power, constant-intensity unstructured light.
  • Numerical simulations of four-dimensional configurations for comparison with experimental findings.

Main Results:

  • Observation of a continuous space-time crystal breaking both space and time symmetries.
  • Identification of a space-time crystallization phase formed by particle-like topological solitons.
  • Demonstration of robustness against temporal perturbations and spatiotemporal dislocations, indicating stability.

Conclusions:

  • The observed phenomenon meets established criteria for time-crystalline order.
  • The stability of the space-time crystals is attributed to their topological nature and interactions between solitonic building blocks.
  • Potential applications include optical devices, photonic generators, telecommunications, and anti-counterfeiting.